I selected the option to store the FileVault key in iCloud when I turned on FileVault. According to the Apple article (Use FileVault to encrypt the startup disk on your Mac - Apple Support) I can then use my iCloud account name and password to unlock my startup drive or reset my password. Where would those get entered? And is the process to retrieve the FileVault key automatic at that point?
I also noticed that at the login screen my BT mouse is disabled, so I have to use my wired KB cursor keys to navigate. Is BT supposed to be disabled at that point?
